Diamond testers determine a gemstone’s authenticity by measuring its thermal and electrical conductivity. These devices range from basic models costing under $20 to sophisticated instruments priced over $500. The price typically reflects the tester’s features, accuracy, and overall quality. For instance, a basic thermal conductivity tester might only differentiate diamond from other common simulants, while more advanced devices can identify moissanite, a diamond simulant with similar thermal properties.
Accurate gem identification is crucial for consumers, jewelers, and gemologists. Determining whether a stone is a genuine diamond or a less valuable material protects buyers from fraud and ensures fair pricing. Historically, assessments relied heavily on expert visual inspection. Modern testing equipment provides a more objective and readily accessible method for verifying a gem’s identity, contributing to greater transparency and consumer confidence within the gem trade.